INJURIES BY ROUNDHEADED BORERS. 



353 



ing galleries and scoring (he surface of the sapwood, sometimes 

 almost entirely separating bark from wood. They finally enter the 

 wood, sometimes mining to the lieartwood, where the mine becomes 

 longitudinal. Pupation takes place in either 

 bark or wood, but usually in lieartwood. It 

 is probable that there is but one generation a 

 year and that adults emerge and deposit eggs 

 in July. August, and September. 



The same recommendations for preventing 

 injury as those given for the cedar-tree borer 

 are applicable to this species. 



THE BANDED ASH BORER. 



(ycocljthm <-(i]trini Say.) 



Numerous complaints have been received 

 by the Bureau of Entomology regarding seri- 

 ous damage to ash lumber by the banded ash 

 borer and closely related species. Of all 

 species concerned, however, this is apparently 

 the most destructive, the larvsB perforating 

 the sapwood w r ith their mines (fig. 26) and 

 greatly depreciating its value, if not entirely 

 ruining it. Besides ash, the borer attacks and 

 lives in mesquite and, rarely, in white oak. 



The larva is an elongate, footless, fleshy 

 white grub about an inch in length when 

 mature. The adult is an elongate beetle, 15 

 to 18 mm. in length. The ground-color is 

 black, with four yellowish-white bands on 

 the elytra or wing-covers and one on the 

 anterior border of the prothorax. The tips 

 of the elytra are yellowish white. The 

 female beetle deposits her eggs on the bark 

 of dying or dead trees or logs. There is but 

 one generation a year. The adults usually 

 emerge and deposit eggs in March, April, or 



May. The larvae mine in the bark and sap- FIG. 26. work of the banded 

 wood arid pupate in the sapwood. 



Ash trees cut in the summer, fall, or early 

 winter are less liable to attack from this 

 species than those cut in the spring, but even those cut in the fall are 

 sometimes attacked the following spring. The best way to prevent 

 injury to logs cut during the winter and spring, when the logs are 



ash borer (Neoclytus ca- 

 prceu). Section of ash 

 log showing larval mines. 

 (Original.) 





